Bruce doesn't look any less uneasy, though now for a plethora of reasons related to curing himself or not curing himself, and he's grateful for Tony's steadying touch. He's been down the road of an obsession to cure himself, and he's had some dark days, mixed up with all the rest. He's afraid of going back to that place; he wasn't always so zen in his search for a cure.

If Tony's bragging, Bruce doesn't hear it. A lot of scientists can't see the flaws in their own work. Bruce could've used a few outside opinions, back in the day. Tony clearly trusts him with the information, but is that even wise? Hasn't Bruce proven that he's unstable, unsteady, especially when given the means to alter himself? He won't go making a superhuman army, he's not about to weaponize anything, but Bruce has made plenty of mistakes in his time.

"Okay," he says quickly, like he has to say it fast or else he won't be able to say it at all, "but we have to be careful with whatever notes we take. They can't fall into the wrong hands."